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"Operating examples" chapter provides more information concerning correct connection of powermeters and
energy meters to the calibrator.
Uncertainty calculation of set power
Uncertainty of set power displayed on the Accuracy line of the display is calculated according to the following
formula:
for active power
for reactive power
for apparent power
where
dP is the uncertainty of set power
dU is the uncertainty of set voltage
dI is the uncertainty of set current
dPF is the uncertainty of set PF (cosϕ)
dPF* is the uncertainty of set sinϕ
Generation of frequency
The multifunction calibrator can generate several different voltage shapes with exact frequency, amplitude and
duty cycle. The output signal is present at BNC coaxial connector FREQ located at the front panel. The signal is
not present at any other output terminal.
There are two frequency generation modes. The first mode (PWM) allows the generation of squarewave output
signal with calibrated amplitude, frequency and duty cycle. Frequency range is up to 10 kHz. The second mode
(HF) also provides squarewave output signal with very steep rising edge, typically less than 3 ns.
PWM mode
Frequency range:
Voltage range:
Signal shapes:
HF mode
Frequency range:
Voltage range:
Signal shapes:
PWM mode can be used to calibrate the input sensitivity of oscilloscopes at frequencies up to 10 kHz. HF mode
can be used to calibrate the time base of oscilloscopes.
To switch between the modes, keep pressing "F" direct mode button. The display includes the symbols for
currently selected mode (PWM or HF).
Control in the frequency mode
•
Press F direct mode button. The calibrator switches to PWM mode. If HF mode is desired, press F button
once more. The main data on the display is the frequency.
•
The display shows the following data:
Manuel de l'utilisateur
d P = √ ( dU
2
2
+ dI
+ dPF
d P = √ ( dU
2
2
+ dI
+ dPF*
d P = √ ( dU
2
2
+ dI
+ 0.03
0.1 Hz to 100 kHz
1 mV to 10 Vpp
squarewave, negative PWM NEG – symmetrical PWM SYM – positive
PWM POS
0.1 Hz to 20 MHz
5 V
0, -10, -20, -30 dB
pk-pk
symmetrical squarewave
Calibrateur multifonctions CX 1651
2
2
+ 0.03
) [%]
2
2
+ 0.03
) [%]
2
) [%]
[%]
[%]
[%]
[%]
[%]
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